The original in 16-bit mode is linear 14-bit acquire using Umax PowerLook III scanner into Photoshop 15-bit space and then cropped.

Sharpening errors in gamma space:

1. edges deteriorte
2. eye areas gets bad gauze.
3. text gets bad gauze.
4. The overall sharpening is weaker.

Linear space processing

1. Open the original linear higher bit-depth image.
2. convert to 8-bit mode.
3. apply USM at amount=500%, radius=0.5, thereshold=0.
4. apply inverse gamma 2.2.
5. save as jpeg using quality factor 4.

Gamma-space processing

1. Open the original linear higher bit-depth image.
2. apply inverse gamma 2.2.
3. convert to 8-bit mode.
4. apply USM at amount=500%, radius=0.5, thereshold=0.
5. save as jpeg using quality factor 4.